Biostatistics 100A Lab 2 Answers
I. Computer Exercise
1. Printout with summary statistics by disease subgroup for hemoglobin levels. Find
medians, means, ranges, interquartile ranges and standard deviations for hemoglobin
levels by disease types.
Acyanotic Group
Mean: 13.45
Median: 13.1
Range: max-min=20.5-11=9.5
Interquartile range (IQR): Q3-Q1 (75th percentile-25th percentile) 14.1-12.2=1.9
Standard deviation: 1.98
Cyanotic Group
Mean: 14.65
Median: 14.8
Range: 19.3-5.4=13.9
Interquartile range (IQR): 17.15-13.45=3.7
Standard deviation: 3.5
2. Boxplots and histograms by disease subgroups for the variable hemoglobin. Does the
distribution of hemoglobin appear to differ between acyanotic and cyanotic children
with congenital heart disease?
LOW OUTLIER: <Q1-1.5*IQR
I. Computer Exercise
1. Printout with summary statistics by disease subgroup for hemoglobin levels. Find
medians, means, ranges, interquartile ranges and standard deviations for hemoglobin
levels by disease types.
Acyanotic Group
Mean: 13.45
Median: 13.1
Range: max-min=20.5-11=9.5
Interquartile range (IQR): Q3-Q1 (75th percentile-25th percentile) 14.1-12.2=1.9
Standard deviation: 1.98
Cyanotic Group
Mean: 14.65
Median: 14.8
Range: 19.3-5.4=13.9
Interquartile range (IQR): 17.15-13.45=3.7
Standard deviation: 3.5
2. Boxplots and histograms by disease subgroups for the variable hemoglobin. Does the
distribution of hemoglobin appear to differ between acyanotic and cyanotic children
with congenital heart disease?
LOW OUTLIER: <Q1-1.5*IQR
